单轴应力下水泥土细观结构的演化特性

Evolution characteristics of microstructure of cement-soil under uniaxial stress

通过单轴压缩条件下不同养护温度及不同土料的水泥土微细结构变化试验,探讨了单轴压缩条件下水泥土微细结构内部变化规律及其与宏观力学响应的关系.利用Geoimage软件定量分析研究了颗粒面积比例、颗粒分布分维、颗粒圆度和孔隙定向度的演化规律,并与全应力应变曲线进行了对比.结果表明,单轴压缩条件下土样细部结构形态和参数均会发生明显变化.

Based on the experiments on the microstructure of cement-soil of different soil materials at different curing temperatures under uniaxial compression, the regularity of the micmstructure of cement-soil under uniaxial compression and its relationship with the macro-mechanical response were discussed. By use of the Geoimage software, a quantitative analysis was performed on the evolution of proportion of grain surface area, grain distribution and fractals, grain roundness, and pore orientation, as well as their comparison with the complete stress-strain curve. It is demonstrated that the configuration of the microstructure of cement-soil samples and their parameters will obviously change under uniaxial compression.